Electrically controlled pump motor



Dec. 14, 1954 B. HARPER ELECTRICALLY CONTROLLED PUMP MOTOR F iled June 4, 1952 M 4 ATTORNEYS United States Patent Ofltice 2,697,196

Patented, Dec. 14, 1954 2, the globuleof mercury is at' the right hand end of the; tubular-container 18-. When the fluid buoys the; bulb 1-,7 upwardly, the globulemoves to the left and immerses ELECTRICALLY CONTROLLED PUMP MOTOR bet-weenithe leadS;23 a tlzti. Both switches is and 16 are Toby Harper Tulsa Oklaittisit i s itihi iiiii ti iiiii"605323012?fili g;

4 Claims. (Cl. 318482) motor Control circuit, for; the. pump, The motor 29 may between drive shaft and sucker rod. A power supply supplies power to posts 30 and 31. Tracing the side I This invention relates to an apparatus for controlling t h P W L PP X rm g tp 1t P through the operation of a motor for pumping: fluid from, a: well wire connector Q32 into the. cable. 2 8. and downwardly to and more particularly to apparatus for'controlling operaone of the electrical terminalsin sw tch 16. and also to one tion 0 a motor for pumping fluid from a well between f h electrical, terminals. in S i ch 15.. Tracing the t defined fl id le l i h ll, other side of the power supply from post 30, it is seen It ha bee the practice i pumping well h a that it goes through connector 33 to one side of the motor oil well whi h are not id d t b very d and through wire connector 34 to one side of a solenoid ducers to pump according to a certain time schedule. The Other slde the seleheld leads threugh \Ylfe his scheme is designed to prevent losing the prime on Connector 36 to one slde Of a Spring-blasted lhlefeswlteh h pump, Th i h d l d d i i d at b 37. Wire connector 38 leads from the same side of this experience alo nd i o t i t, i hi h case mlcroswitch back to the other side of the motor From t e prime is sometimes lost. This necessitates effort and t Same slde 0f the solenold 35 W re connector 39 leads delay which is often very costly. into the cable 28 downwardly to the other electrical tert is therefore an ob ect of this invention to regulate mlhal e SWlteh Th W r onn tor 40 from the operation of the pump automatically to prevent any the mlcroswitch 37 leads lnto the cable 28 and downpossibility of loss of prime. wardly to the other electrical terminal of the switch 15. Broadly speaking, this object is accomplished by em- The mlcroswltch 18 based to a a y p p ploying a series of switches including float switches 10- y a e p 41 and held 111 tension by 0011 Spring cated in the well. These float switches sense the level 42 W lch is m t at one end to brace 43 which pof the fluid and determine when the pumps should or P t h mlerOSWlteh and t the her end to arm 44 should not operate. They insure that the pump will which is connected to the topmost terminal of the switch operate only when the level of the fluid is enough to pro- 45 and pivoted 46 t0 the brace 43 vide i b prime f h Pump Following the side of the power supply to the motor ese and other objects will become apparent from whleh amves at P 30, W See that It P e through a d t il d d i i of h accompanying drawings wire connector 34 to solenoid 35. The other side of the Figure 1 is a figure partly in section and partly dia- Solenoid 35 Passes throligh Wire Connector 39 throhgh grammatic showing a cased well including the tubing SWlteh 15 t0 the other Side of the POWer pp y Whleh and the pump motor, and also including the control cirarhl'vehat P t can be Seen: that the P cuit for the pump motor; noid will not be energized through this path unless switch Figure 2 iS a view partly in section f one f the fl t 16 is closed. Therefore the mlcroswltch which is opswitches which is in accordance with this invention; suited by solenold 35 W111 not Operate unless. float and switch 16 is closed. Therefore, as the fluid level in the Figure 3 i another View partly i section f the fl t tubing uses it first closes float switch 15. With float switch of Figure 2.

Referring to Figure 1, numeral 10 indicates the casing Plete P h fluid IeVel Q t to rise Y the tubing is a valve 14 which is, in the usual case, a microswitch 37 closes and therefore the motor 29 comcheck valve. The fluid is removed in the usual manner memes to h AS the q q level falls below the by f i the sucker rod downwardly- The fl id which level of float switch 16, the SOIGIXOId will still remain enhas entered the tubing through the check valve 14 which erglzed and the mercury switch 37 still closed because the 13 and the check valve 14 is closed. On the upstrok fluid is carried upwardly the check valve 1 opens and w connector 40, float switch 15 and wire connector 32.

more fl id i d i to the tubing However, when the liquid level drops below float switch Float switch 15 is located in the well a predetermined 15, thls last rethalhlhg P t h 01 1 d 5 18 roken distance above the bottom of the hole. Float switch 16 and the Solehold 1S e h'llefesWlteh 37 pened is located in the well a predetermined distance above motor PP ThlS then W h fluld to switch 15. The distance between these two switches dep5 rega1h its level Wltheut the motel Operatlhg and the termines the levels between which the pump is to op- Cycle 18 agalh TePeatederate, It can be seen, then, that the motor will not be ener- Turning to Figures 2 and 3, each float it h i glzed until both of the float switches are floated initially prised of a bulb 17 which may be of hollow glass and will m to operate when the topmost Q sealed liquid-tight. A tubular container 18 is formed Swltchi ,that IS 9 15 longer floeted but Whlle integral with the bulb 17 but sealed off from said bulb. fl SWltch 15 18 Sell being floated, and W111 stop p Wlthin this tubular container 18 is a globule of mercury 111g when both float swltches are 110 longer buoyed 11 19. A cap 20 seals the container 18 from the outside. y the flllld h Well- Thls glYes close Control of the Electrical terminals 21 and 22 are provided within the tlme dufmg which the motor W111 Operate e assures container 1 and i leads 23 and 2 engage these ter that the motor will not operate unless theie is suflicient minals within this container. These terminals are spaced head to P a good p e for the P P- The levels one from the other and are partly insulated at 25 and 26. h tWO SWIteheS are $0 edlhsted that a good head f A clamp 27 fits about the cable 28 and is held in posi- Pfhhlhg P p will be maintainedtio n by bolt and nut assembly 29. To this clamp the float What has been disclosed is a specific embodiment of switch is pivotally mounted by means 30. It can be seen so the present invention. Other embodiments obvious from that with the bulb in unfloated position such as in Figure the teachings herein to those skilled in the art are contemplated to be within the spirit and scope of the 01- other side of said power supply being connected to the lowing claims. other side of said motor through two paths, one path What is claimed is: including in series a first float switch positioned in said 1. Apparatus for controlling the operation of a motor well and a solenoid-operated switch, the other path infor pumping fluid from a well that comprises a power 5 eluding in series a second float switch positioned above supply for said motor, one side of said power supply said first float switch in said well and a solenoid to opbeing connected directly to one side of said motor, the crate said solenoid-operated switch, whereby when the other side of said power supply being connected to the fluid level in said well rises above said first float switch, other side of said motor through two paths, one path said first float switch closes and when said fluid level including in series a first float switch positioned in said 0 rises above said second float switch, said second float well and a solenoid-operated switch, the other path inswitch closes to energize said solenoid and close said cluding in series a second float switch positioned above solenoid-operated switch to energize said motor and when said first float switch in said well and a solenoid to opsaid fluid falls below the level of both of said switches erate said solenoid-operated switch. said motor is de-energized.

2. Apparatus as defined by claim 1 wherein said float 15 switcligs are open vvlhein unflboated. h d fi References Cited 1n the file of this patent 3. pparatus as e ned y claim 2 w erein sai oat switches are mercury switches. UNITED STATES PATENTS 4. Apparatus for controlling the operation of a motor Number Name Date for pumping fluid from a well that comprises a power 20 2,110,313 Warrick Mar. 8, 1938 supply for said motor, one side of said power supply 2,467,134 Apr. 12, 1949 Iveson being connected directly to one side of said motor, the 2,589,089 Johnson Mar. 11, 1952 

